class_docstr: Most tests done in the base class LinearOperatorDerivedClassTest.
code: def test_adjoint_of_adjoint_is_operator(self):
      # The matrix values do not effect auto-setting of the flags.
      matrix = [[1.0, 0.0], [1.0, 1.0]]
      operator = linalg.LinearOperatorFullMatrix(matrix)
      operator_adjoint = operator.adjoint()
      self.assertIsInstance(operator_adjoint, LinearOperatorAdjoint)
      adjoint_of_op_adjoint = operator_adjoint.adjoint()
      self.assertIsInstance(
          adjoint_of_op_adjoint, linalg.LinearOperatorFullMatrix
      )
  
imports: import numpy
  from tensorflow.python.framework import config
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import variables
  from tensorflow.python.ops.linalg import linalg
  from tensorflow.python.ops.linalg import linear_operator_adjoint
  from tensorflow.python.ops.linalg import linear_operator_test_util
  from tensorflow.python.platform import test
label_desc: Use image node_id 5 for calling the LinearOperatorAdjointTest obj's underlying member method code with example usage: obj.test_adjoint_of_adjoint_is_operator() without return types